package com.wxmp.core.util;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.BeansException;
import org.springframework.beans.factory.NoSuchBeanDefinitionException;
import org.springframework.context.ApplicationContext;
import org.springframework.context.ApplicationContextAware;
import org.springframework.context.support.ClassPathXmlApplicationContext;

/**
 * @Description	Spring工具.
 * @ClassName	SpringUtils
 * @Date		2016年1月13日 下午8:28:24
 * @Author		lizw
 */
public final class SpringUtils {

	private static Logger logger = LoggerFactory.getLogger(SpringUtils.class);

	private static ApplicationContext applicationContext = null;

	static {
		if (null == SpringUtils.applicationContext) {
			String[] configLocations = { "spring*.xml" };
			try {
				SpringUtils.applicationContext = new ClassPathXmlApplicationContext(configLocations);
			} catch (BeansException beansException) {
				logger.error("SpringUtils[创建应用上下文环境出错]", beansException);
			}
		}
	}

	/**
	 * 获取对象
	 *
	 * @param name
	 * @return Object 一个以所给名字注册的bean的实例
	 * @throws org.springframework.beans.BeansException
	 *
	 */
	@SuppressWarnings("unchecked")
	public static <T> T getBean(String name) throws BeansException {
		return (T) applicationContext.getBean(name);
	}

	/**
	 * 获取类型为requiredType的对象
	 *
	 * @param clz
	 * @return
	 * @throws org.springframework.beans.BeansException
	 *
	 */
	public static <T> T getBean(Class<T> clz) throws BeansException {
		@SuppressWarnings("unchecked")
		T result = (T) applicationContext.getBean(clz);
		return result;
	}

	/**
	 * 如果BeanFactory包含一个与所给名称匹配的bean定义，则返回true
	 *
	 * @param name
	 * @return boolean
	 */
	public static boolean containsBean(String name) {
		return applicationContext.containsBean(name);
	}

	/**
	 * 判断以给定名字注册的bean定义是一个singleton还是一个prototype。
	 * 如果与给定名字相应的bean定义没有被找到，将会抛出一个异常（NoSuchBeanDefinitionException）
	 *
	 * @param name
	 * @return boolean
	 * @throws org.springframework.beans.factory.NoSuchBeanDefinitionException
	 *
	 */
	public static boolean isSingleton(String name) throws NoSuchBeanDefinitionException {
		return applicationContext.isSingleton(name);
	}

	/**
	 * @param name
	 * @return Class 注册对象的类型
	 * @throws org.springframework.beans.factory.NoSuchBeanDefinitionException
	 *
	 */
	public static Class<?> getType(String name) throws NoSuchBeanDefinitionException {
		return applicationContext.getType(name);
	}

	/**
	 * 如果给定的bean名字在bean定义中有别名，则返回这些别名
	 *
	 * @param name
	 * @return
	 * @throws org.springframework.beans.factory.NoSuchBeanDefinitionException
	 *
	 */
	public static String[] getAliases(String name) throws NoSuchBeanDefinitionException {
		return applicationContext.getAliases(name);
	}

}